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anonymous

  • 5 years ago

can some1 help? if so thank you state whether or not the equation is identity if so prove it sec(-x)=sec(x) sec^2(x)-csc^2(x) = tan^2(x) - cot^2(x) cos^2(sec(x)+1)^2=(1+cosx)^2

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  1. anonymous
    • 5 years ago
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    yes they are three different problems any help wld be apreciated i dont understand this stuff thanks

  2. amistre64
    • 5 years ago
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    cos(x) = cos(-x) so 1st is true

  3. myininaya
    • 5 years ago
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    since cosx is an even function! :)

  4. myininaya
    • 5 years ago
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    that means it is symmetric about the y-axis!

  5. myininaya
    • 5 years ago
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    what can say about 1/cos(-x)=1/cosx now?

  6. myininaya
    • 5 years ago
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    i will be back i must eat :)

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